Abstract: The surface of leaves was studied by SEM in the following four Limonium species: Limonium gmelinii (Willd.) Kuntze, Limonium otolepis (Schrenk) Kuntze, Limonium myrianthum (Schrenk) Kuntze and Limonium auream, Inorder to research the relationships between the microstructure of plants and environment. The result shows that each of these four plants has a distributing of salt gland in their upper and lower epidermis of leaf，Most of them are consisted of 20 cells, and 4 out of 20 respectively has a small hole on the center of cuticle. The salt release of plant relies on the salt-secreting holes of salt gland. However, each of the four species has a difference in the density, the size and the position of the salt gland. During the long-time adaptation to the special habitat of saline-alkali, and this enables a plant to differentiate strongly into salt-secreting structure, Therefore, it is obvious significance in ecological adaptation.

Key words: Limonium, salt-secreting structure, scanning electron microscopy